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Old 08-31-2011, 08:20 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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The 1990 Engine Control Wiring Harness


*****IMPORTANT*****
Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers.
*******************

As we all know, the 1990 model year had many quirks to it when compared to the later model 1Gs. Because this was a single (and the first) year of the Eclipse/Talon/Laser trio, information on these cars isn’t nearly as abundant as 1991-1994 models.

I don’t plan to dive into and explain the differences between these models as there are plenty of threads around naming the differences. In short, this article is a configuration diagram. It aims to familiarize members with the 1990 4G63 turbo engine control harness electrical connections, similar to what snowborder714 did in his 2g Engine Bay Electrical Connections article, but not nearly as thorough. To be clear, this article does not cover every electrical connection in the 1990 engine bay, only those on the engine control harness, including the handful of interior connections.

NOT THE HARNESS YOU'RE LOOKING FOR? SEE ALSO: The 1990 Engine COMPARTMENT Wiring Harness.

As a couple extras, it will touch on some connector differences that must be attended to when swapping a 1990 turbo engine control harness into a later model 1G or vice versa (these are denoted by **). It lists original wire colors and original individual wire locations as viewed from the wire side of the connector as well as a visual of each connector on the harness.

Also, for comparison, here is a similar page for the later model 1Gs (those connectors labeled with * are either completely different, in a different location, or non-existent on the later model 1Gs): 1Gb DSM 4G63 Turbo Wiring Harness Diagram

First and foremost, the main harness itself. The alphanumeric identifiers relate to those in the 1991 configuration diagram found in the electronic copy of the factory service manual: Download the 1G Service Manuals. The harness displayed here is a 1990 turbo engine harness which, by consequence, means it is from a vehicle with a manual transmission.

Click to enlarge slightly or zoom by pressing Control and + (the plus sign):

To shrink, press Control and - (the minus or negative sign).

A-08: Dual Pressure Switch
A-09: Wiper Motor
A-10: Control Wiring Harness and Battery Cable Assembly Combination
*A-11: Auto-Cruise Control Vacuum Pump
A-12: Brake Fluid Level Sensor
A-13: Control Wiring Harness and Solenoid Valve Harness Assembly Combination
A-36: Air Flow Sensor
A-51: Waste Gate Solenoid
A-52: Control Wiring Harness and Engine Compartment Wiring Harness Combination
A-53: Control Wiring Harness and Engine Compartment Wiring harness Combination
A-55: Fuel Pump Check Connector
A-56: Noise Condenser
A-57: Defogger Relay
A-58: Injector Resistor Pack
A-59: Engine Speed Adjustment Connector
A-60: Ignition Timing Adjustment Connector

*B-00: Noise Filter (for Tachometer)
B-01: Injector No. 4
*B-02 & B-05: Throttle Position Sensor and Idle Switch
**B-04: Idle Speed Control Actuator
B-06: Injector No. 3
B-07: Detonation (Knock) Sensor
B-08: EGR Temperature Sensor
B-09: Injector No. 2
B-10: Injector No. 1
*B-14: Ignition Coil (Coil Pack)
*B-15: Power Transistor Unit
B-16: A/C Magnetic Clutch
B-26: Oxygen Sensor
B-29: Engine Coolant Temperature Gauge Unit
B-30: Engine Coolant Temperature Sensor (for ECU)
B-31: Engine Coolant Temperature Switch (for A/C)
*B-32: Crank Angle and Top Dead Center Sensor (Cam Angle Sensor, CAS)

C-56: Oxygen Sensor Check Connector
C-57: Control Wiring Harness and Body Wiring Harness Combination (1-pin, passenger side kick panel)
**C-58: Control Wiring Harness and Body Wiring Harness Combination (14-pin, passenger side kick panel)
C-59: Control Wiring Harness and Body Wiring Harness Combination (6-pin, passenger side kick panel)
C-63: MPI Control Relay
C-64: MPI Control Unit (ECU, small connector)
C-65: MPI Control Unit (ECU, medium connector)
**C-66: MPI Control Unit (ECU, large connector)
**C-67: Control Wiring Harness and Body Wiring Harness Combination (under center console)

The wire color layout diagrams accompanying each picture are as seen FROM the HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. They should be color coded correctly, but if there is a disagreement with the letters and the color of the letters, go by the letters. When two colors are listed together, the first is the main color and the second is the color of the stripe or tracer. The letters represent the following colors:

B - Black
W - White
R - Red
G - Green
L - Blue
Y - Yellow
O - Orange
Lg – Light Green

PM me if you find any errors and I will make corrections as necessary.
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Last edited by 19Eclipse90; 03-16-2014 at 12:13 PM. Reason: Enlarged wire color diagrams in all posts and location numbers in the layout diagram.

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Old 08-31-2011, 08:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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A-08: Dual Pressure Switch
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Old 08-31-2011, 08:23 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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A-09: Wiper Motor

Need a new Wiper Motor connector? See: DSD04 F.
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Old 08-31-2011, 08:24 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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A-10: Control Wiring Harness and Battery Cable Assembly Combination

Quote:
Originally Posted by 19Eclipse90 View Post
The two black w/ yellow wires are involved in the starting circuit and run to the starter motor/solenoid. The red and red w/ blue wire are for the reverse lights sensor.
Need a new Control Wiring Harness and Battery Cable Assembly Combination connector? See NMWP 4P Female.
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Old 08-31-2011, 08:25 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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*A-11: Auto-Cruise Control Vacuum Pump

One of the “mystery” connectors that seems to come up relatively frequently, 1990 models had the cruise control unit in front of the battery instead of on the firewall like the 1991+ models.

Need a new Auto-Cruise Control Vacuum Pump connector? See NMWP 4P Female.
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Old 08-31-2011, 08:26 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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A-12: Brake Fluid Level Sensor

Need a new Brake Fluid Level harness connector? See: DSD02 F.
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Old 08-31-2011, 08:27 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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A-13: Control Wiring Harness and Solenoid Valve Harness Assembly Combination

Need a replacement connector to attach to your solenoid valve harness? See: NMWP 6P Female.

Have this open and want to seal it up? Use this male connector to protect it from the elements! See: NMWP 6P Male.
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A-36: Air Flow Sensor

The picture below is for a turbo MAF. A non-turbo harness has only six wires (in two rows of three) running to it -- the one that will not be present is the green with white stripe which runs to pin 14 on C-66.

Need a new 1G turbo MAF connector? See NMWP 8P female.

Need a new 1G non-turbo MAF connector? See: NMWP 6P Female.

Interested in upgrading to a 2G MAF and don't have the connector? See: CON-2GMAF-8F.
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Last edited by 19Eclipse90; 03-20-2014 at 06:26 PM.

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A-51: Waste Gate Solenoid

1G ECU Pinouts

ERROR: Note that the "yellow" wire is actually ORANGE and runs to pin 105 of the ECU.


Need a new Brake Fluid Level Sensor harness connector? See: DSD02 F.
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Last edited by 19Eclipse90; 02-28-2014 at 08:25 PM.

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Old 08-31-2011, 08:29 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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A-52: Control Wiring Harness and Engine Compartment Wiring Harness Combination

Need a new harness combination connector? See: DSD04 F.
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A-53: Control Wiring Harness and Engine Compartment Wiring harness Combination
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Last edited by 19Eclipse90; 10-21-2011 at 08:48 PM.

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A-55: Fuel Pump Check Connector

Just a short note of interest for you folks with a 1991 engine harness: 1g base timeing/confusing.

Need a new Fuel Pump Check connector? See: DSD01 F.
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A-56: Noise Condenser
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Old 08-31-2011, 08:32 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #14 (permalink)
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A-57: Defogger Relay
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Old 08-31-2011, 08:33 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #15 (permalink)
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A-58: Injector Resistor Pack

Make sure not to confuse this with B-04: Idle Speed Control Actuator.

Need a new Injector Resistor Pack harness connector? See: NMWP 6P Female.

Need the mating connector for the injector restistor pack? See: NMWP 6P Male.
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Old 08-31-2011, 08:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #16 (permalink)
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A-59: Engine Speed Adjustment Connector

Need a new Engine Speed Adjustment connector? See: DSD01 F.
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Old 08-31-2011, 08:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #17 (permalink)
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A-60: Ignition Timing Adjustment Connector

Need a new Ignition Timing Adjustment cover to seal this terminal up? See: NMWP 2P B Female.

Need a new Ignition Timing Adjustment harness connector? See: NMWP 2P Male.
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Old 08-31-2011, 08:35 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #18 (permalink)
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B-00: Noise Filter (for Tachometer)

For good measure, you can check this link to see what, exactly, connects here. If this is missing, your 1990 tachometer will not work: Rpm Gauge

Fortunately, there are ways to get around having the filter. Check this useful article out for details: How To: Fix a 1990 DSM tach..

NOTE: After numerous trips to the junkyard, I've collected a small (5) supply of these noise filters. They all work as I have tried them on my own vehicle. The kicker is that they are not all from 1990 model 1Gs. A couple of them were pulled from late 80's/early 90's model Colts. These filters are mounted by one M6 (that's a 10mm head) bolt. They have the same shape connector on them as the 1990 unit. Something else I found is that, in order for the noise filter to work correctly, the filter (or mounting bracket, as is the case for the Colt style filter) must be grounded to the intake manifold. If this is not done, the tachometer will jump around and tends to get stuck around 3000rpm. The Colt part number is MB627900 or MB627901, depending on options; either should work. Having said that, I wouldn't expect them to be any cheaper new than the 1G units.

Need a new Noise Filter harness connector? See: DSD02 F.
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Old 08-31-2011, 08:36 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #19 (permalink)
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B-01: Injector No. 4

Looking for a new injector connector? See JFC 2P.
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Old 08-31-2011, 08:37 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #20 (permalink)
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B-02 & B-05: Throttle Position Sensor and Idle Switch

The 1990 model integrated the idle switch into the throttle position sensor connector. When using a 1991+ throttle body, the green wire in the dotted box would need to run to the idle switch. For a write up on this site: 1990 Swap to 91-94 Throttle Body

Need a new 1990 harness side TPS connector? See NMWP 4P Male.

Need a new 1990 sensor side TPS connector? See NMWP 4P Female.

Have a 1991+ TPS? See JFC 4PB .
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